Developed in 1954 as a multirole helicopter.  Known as H-34A Choctaw by the U.S. Army, HUS-1 in the U.S. Marines, and HSS-1 in the U.S. Navy as an ASW helicopter.


Data on design, manufacture and status

Design authority: Sikorsky Aircraft Corp.

Primary manufacturer: Sikorsky Aircraft Corp.

Parent type: Sikorsky S-58/H-34

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 4.85 m 15.9 ft
Overall Length: 20.03 m 65.7 ft
Overall Width: 17.07 m 56.0 ft
Airframe Dimensions
Airframe Length: 13.46 m 44.2 ft
Airframe Width: 3.89 m 12.8 ft
Airframe Height: 4.37 m 14.3 ft
Landing Gear Dimensions
Landing Gear Base: 4.27 m 14.0 ft
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 97 mph (156 km/h)

Max Gross Weight (ground): 6,350 kg 13,999 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 6,350 kg 13,999 lb
Empty Weight: 3,583 kg 7,899 lb
Useful Load: 2,767 kg 6,100 lb
Empty Weight Fraction: 0.564
Climb Performance
Max Rate of Climb: 6 m/s 1,099 fpm
Hover Performance
Hover Ceiling IGE: 1,494 m 4,900 ft
Hover Ceiling OGE:  
Max Level Flight Speed: 196 km/h 106 kts
Never Exceed Speed:  
Service Ceiling: 2,896 m 9,501 ft
Range and Endurance
Max Range: 293 km 158 nm
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

Provided powerplant data is for uninstalled, sea level, static operations.

Normal Ratings
Max continuous: 1137 kW 1524 hp
Take-off / rated:  
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Foldable main rotor.

Main Rotor Characteristics
Diameter: 17.07 m 56.00 ft
Direction of Rotation: Counterclockwise
Hub Type:  
Main Rotor Blade Characteristics
Blade Construction: NACA 0012 airfoil
Blade Chord: 0.416 m 1.37 ft
Blade Tip Geometry:  
Blade Twist: -0.140 rad -8.000 deg
Number of Blades: 4
Main Rotor Derived Characteristics
Disc Area: 228.85 m² 2463.4 ft²
Disc Loading: 27.75 kg/m² 5.683 lb/ft²
Solidity: 0.0621
Main Rotor Blade Derived Characteristics
Blade area per blade: 3.55 m² 38.3 ft²
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Diameter: 2.67 m 8.75 ft
Configuration: Pusher
Direction of Rotation: Top blade fwd
Tail Rotor Blade Characteristics
Number of Blades: 4
Blade Construction: NACA 0012 airfoil
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area: 5.59 m² 60.1 ft²
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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